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Which ones are you thinking about, because you can use any function that exists in the module.
Guess your meaning the ones that are intended for use, like the smarty functions.
If you've got a particular case your interested in, I cant try to get the docs up for it.
Currently if the 'support' module is enabled, it adds a HELP tab to all the modules which then links to the docs.
https://www.jamroom.net/the-jamroom-network/documentation/contents
The intention is to get the docs as complete as possible, which could include available functions